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APU Sound Model Tutorial. Overview. KC-135R APU Sound Recording/Analysis V + Modeling. KC-135R APU. KC-135R Has Two APU’s Units are Located in Open Aft Cabin Area Sound Level is Significant in Cockpit. Notes on Recording. Need Calibrated SPL Microphone - PowerPoint PPT Presentation
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SimPhonics, Inc.
APU Sound Model APU Sound Model TutorialTutorial
SimPhonics, Inc.
• KC-135R APU
• Sound Recording/Analysis
• V+ Modeling
OverviewOverview
SimPhonics, Inc.
KC-135R APUKC-135R APU
• KC-135R Has Two APU’s– Units are Located in Open Aft Cabin Area– Sound Level is Significant in Cockpit
• KC-135R Has Two APU’s– Units are Located in Open Aft Cabin Area– Sound Level is Significant in Cockpit
SimPhonics, Inc.
Notes on RecordingNotes on Recording
• Need Calibrated SPL Microphone– Record at Source for Model Details– Record in Cockpit for FAA Level D
Certification
• Record Digitally– (24 Bit) Mono– Associate with Instrumentation if Possible
• Need Calibrated SPL Microphone– Record at Source for Model Details– Record in Cockpit for FAA Level D
Certification
• Record Digitally– (24 Bit) Mono– Associate with Instrumentation if Possible
SimPhonics, Inc.
Sound Analysis ToolsSound Analysis Tools
• Adobe Audition– Adobe Systems Incorporated– Edit in Frequency Domain
• Adobe Audition– Adobe Systems Incorporated– Edit in Frequency Domain
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Sound SpectrographSound SpectrographTime
FreqBrighter Colors Are Greater Amplitudes
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APU Sound ComponentsAPU Sound Components
• Intake/Exhaust Door Open/Close
• Start Motor
• Turbine and Noise Spectra
• Bleed Air Valve Open
• Intake/Exhaust Door Open/Close
• Start Motor
• Turbine and Noise Spectra
• Bleed Air Valve Open
SimPhonics, Inc.
APU Sound ComponentsAPU Sound Components
Start Motor
Door Open
Turbine Bleed Air Valve Open
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Enlarged Start SectionEnlarged Start SectionStart Motor
Door Open
Turbine Spool
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Starter MotorStarter Motor
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TurbineTurbine
Turbine Discrete Blade Passing Frequency(DBPF – NTSB term)
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Turbine RemovedTurbine Removed
Removed Turbine DBPF
SimPhonics, Inc.
Model InputsModel Inputs
• Intake/Exhaust Door Open/Close, Start Motor, Bleed Air Valve
• Discrete Events
• Turbine• Model Based on RPM From Host
• Intake/Exhaust Door Open/Close, Start Motor, Bleed Air Valve
• Discrete Events
• Turbine• Model Based on RPM From Host
SimPhonics, Inc.
V+ APU ModelV+ APU Model
SimPhonics, Inc.
• Very high fidelity model
• V+ and FXDirect enabling technologies
• That was just an APU
• Modular design eases re-use
SummarySummary
